When sodium ethyl xanthate is used, purity of xanthate does not correspond with a recovery of flotation. The experiment was executed to investigate these causes.
As impurities in sodium ethyl xanthate, sodium thiocarbonate (Na
2CO
3), sodium sulfite (Na
2SO
3), sodium sulphide (Na
2S), sodium carbonate (Na
2CO
3), sodium thiosulphate (Na
2S
2O
3), and caustic soda (NaOH) are mentioned.
According to the result of the experiment with chalcopyrite, pure xanthate gives a weak bubble, and the result is unfavorable. Xanthate containing more or less sodium thiocarbonate and sodium sulphide as impurity promotes the mineral floating, and the result is favorable.
Accordingly the quality of xanthate is not decided by purity only; it is advisable to indicate the kinds of impurities.
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